Check it out in the winter and you will be able to judge what you think is the mockorange and what isn't, by the bark, then try to eliminate what isn't and prune back the MO.

Here is a link that might be useful: Propagating Perennials

Actually, mock oranges have a very distinctive flower and once you smell it you'll know it. They are wonderful and, along with lupines and peonies, are probably my favorite plant scent wise.

If after seeing it bloom you are sure it is a mock orange, and if you are sure the other plants are just weeds, while the plants are leafed out that would be the time to get rid of the weedy plants by cutting them away from the mock orange. Then you can simply take a few of the stems of mock orange and layer them on the ground to create more of them. That way you'll have shrubs available to place where you want them to go.
Here's a picture of a boquet of flowers that I grew that has two varieties of mock orange in them, the single and the double. (The single is to the right and the double to the bottom left.) A major clue is mock orange blooms at the same time as mid to late season peonies.
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What a lovely bouquet lovetogarden.That must smell wonderful!I plan to buy a bareroot in the future.How should I plant it?Sideways?Is there a top or bottom?

Thanks to both for the info! I agree, a lovely bouquet!!! I now know it is a M.O. and you are right, it does smell wonderful! You inspired me, I brought some inside today and can't keep my nose away from it. lol Thanks again!